Furnace



2`Sheets-Sheet 1.

(No Model.)

J. MARSHALL.

FURNAGE.

No. 475,984.' Patented May 31, 1892.

wim N (No Model.) i 2 sheets-sheet 2.- J. MARSHALL.

` FURNAGB.

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Fre s- W mJl/farsizal i, @y mme-YS) may be drawn.

UNITED STATES `PATENT OFFICE.

JAMES MARSHALL, OF PLAINS, ASSIGNOR OF ONE-HALF TO VOLCOTT J. PARMELEE, OF VVILKES-BARR, PENNSYLVANIA.

FURNACE.

SPECIFICATION forming part of Letters patentino. 475,984, dated May 31, 1892. Application tiled May 5, 1891. `'Serial No. 391,686. (No model.)

To all whom, it may concern:

Be it known that I, JAMES MARSHALL, a citizen of the United States, residing at Plains,in the county of Luzerne and State of Pennsylvania, have invented a new and useful Fur- 3 nace, of which the following is a specification.

y pointed ont in the claims.

In the drawings hereto annexed, Figure 1 is a perspective view of my improved furnace, the parts of the same broken away for the purpose lof showing the interior construction. Fig. 2 is a central longitudinal sectional View of the same. Fig. 3 is a vertical transverse sectional vie-w taken on the line 3 3 in Fig. 2. Fig. f1 is a horizontal sectional view taken on the line 4 4t in Fig. 2. Fig. 5 is a vertical transverse sectional view taken on the line 5 5 in Fig. 2.

Like numerals of reference indicate like parts in all the figures.

The outer furnace wall or casing, which is designated by 1, is preferably rectangular in shape, and at the front end of the same is constructed the tine or smoke-stack 2, the upper part of which is provided with an ordinary damper 2, mounted upon a rock-shaft 2b, having a crank-arm 2, extending without the smoke-stack and connected with an operatingrod 2, as illustrated.

The {ire-box 3 is constructed transversely at the front end of the furnace-casing, and it has the grate 4, under which the ash-pit 5 is located, said ash-pit being provided at one end with a door (i, through which the ashes The front wall of the furnacecasing has the feed-openings 7, communicating with the fire-box, and is provided with the hoppers 8, through which fuel may be supplied.

Suitably constructed longitudinally within the furnace-casing in rear of the lire-box are l the boxes or receptacles 9. Fines 10 extend from the ends of the lire-box between the side `walls of the furnace and the outer side walls shown at 13, and extended above the top of vthe lire-box to the flue orsmoke-stack 2, with which it is connected. The top of the furnace-casing, which is designated by le, is built over the several fines, which are thus closed, while the upper ends of the receptacles 9 are left open.

Snitably constructed in the furnace-casing below the receptacles 9 are the pits l5, having inclined frontends. Grooved cleats 16 are arranged horizontally between the upper ends of the pits 15 and the lower ends of the receptacles 9, and in these grooved cleats are mounted the slides 17, having handles 18, which project through the rear wall of the furnace-casing. The slides 17 may be withdrawn when desired, so as to permit the contents of the receptacles 9 to drop into the pits 15, and the latter are open at their rear ends, so as to enable the contents of said pits to be drawn out. A

In Aoperation the chambers or receptacles 9 are packed with animal charcoal and the spindles of the axles are inserted therein. The products of combustion pass from the furnace through the ilnes 10, ll,and 12 to the chimney or smoke-stack, and it will be observed that the receptacles 9 are inclosed on three sides by the said nues, While the fourth side is formed by the back wall ofthe furnace. The said chambers or receptacles, with their contents, are thus constantly kept in a highlyheated condition, thus causing the spindles which are being operated upon to be hardened evenly and rapidly. The contents of the receptacles 9 may, whenever desired, be dumped into the pit 15 by simply withdrawing the slides 17, thus enabling said casing or receptacles to be repacked Without interrupting the fires.

It will be seen that by this invention the IOO operation of case-hardening the spindles may be carried out in a rapid, efficient, and economical manner and without necessity for letting the furnace-fires go down at any time.

Having thus described my invention, what I claim is l. In a furnace of the class described, the combination of the furnace-casing, the firebox constructed transversely at the front end of the same, the chambers or receptacles open at top and bottom for charging and discharging the same and being construct-ed longitudinally in the furnace-casing, removable bottom plates closing the bottom openings in said receptacles, the flues extending from the ends of the fire-box between the side walls of the furnace-casing and the outer sides of the longitudinal receptacles, the intermediate flue extending between the inner side walls of said receptacles and connected at its rear end with the outer flues, and the chimney or smoke-stack arranged at the front end of the furnace-casing and connected with the up- I the chambers 9, open at the top, the sliding bottoms 17 for the chambers, the iiues 10, 11, and l2, leading from the lire-box and enveloping the sides of the chambers, and the smokestack communicating with the flue 12 and also located at the front end of the furnace,

substantially as set forth.

and the slides separating said receptacles from said pits, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I have hereto afiixel my signature in presence of witnesses.

JAMES MARSHALL.

Witnesses:

FRANK W. PARMELEE, D. L. ONIELL, J. EDWARD WATTS. 

